Attorn



1932 E. F. O YSTER 1,884,172

JOLT SQUEEZE STRIPPER LATCH Filed Sept. 14, 1931 2 Sheets-Sheet 1INVENTOR.

3/ 32 ATTORNE 5;

Oct.

E F. OYSTER 1,884,172

JOLT SQUEEZE STRIPPER LATCH Filed Sept. 14, 1931 2 Sheets-Sheet 2INVENTOR.

BY 6dr? 5? 03/4 in A TTORN Patented Oct. '25, 1932 UNITED STATES.

, EARL I. OYSTER, F CLEVELAND HEIGHTS, OHIO, ASSIGNOR TO THE OSBORNMANU- PATENTJ OFFICE g FAGTUBING COMIANY, OF CLEVELAND, OHIO, A.CORPORATION OF OHIO a JOL'I. SQUEEZESTRIPPER LATCH Application .filedSeptember 14, 1931. Serial No. 562,659.

This invention relates to molding machines and particularly to animproved latch for a jolt squeeze stripper. In the field of jolt squeezestripper moldingmachines, it is quite common to use dogs or latches tohold the lifting frame up as it returns from the squeeze position andthus keep the mold in an elevated position While the pattern is drawndownward and out of the mold. A common defect in allof the machines nowon the market, is thatthe dogs jolt against the rods in which theyengage during the jolting action and this materially increases the wearon the dogsv and the consequent maintenance cost.

g The purpose of this machine is to provide a latch and operatingmechanism therefor which will automatically engage the lifting frameduring the drawing operation, but

which can be quickly withdrawn from engagement therewith and positivelyheld out of engagement during the j olting operation, the movement ofthis latch being such as not to interfere in any manner with theoperation of the machine. To the accomplishment of the foregoing andrelated ends, said invention, then, consists of the means hereinafterfully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which theprinciple of the invention. may be used.

In said annexed drawings:

.Fig. 1 is a front elevation showingthe application of the latchmechanism to .a down draw molding machine, shown in the joltingposition; Fig. 2 is a plan view approximately on the line 2 -2 of Fig.1; Fig. 3 is a partial front elevation of the latch mechanism with themachine in the squeeze position; Fig. 4 is a view similar to Fig. 3showing the parts in the draw position; Fig. 5is a view similar to Fig.3 showing the parts moving down toward the draw positionpand Fig. 6 isan enlargement in front elevation of the locking mechanism in theposition of Fig. 1.

As will be seen from Fig. 1, the latch mechanism embodying the inventionis adapted to be mounted on a jolt squeeze stripper molding machine ofconventional type adapted for down draw and having a base 1 supportmg atable 2 by a squeeze cylinder 3 and draw cylinders 4. A jolt cylinder 5is contained within the squeeze cylinder. The machine is adapted for theusual cycle of molding operations which includes squeezing the mold (notshown) upward against a stationary squeeze head suchas 6. i

The table supporting elements 11 of the latch mechanism are duplicatedon each side of the machine, but in the preferred embodiment hereinillustrated it is not necessary to halvethe entire mechanism repeated oneach si e.

Each latch comprises a vertical supporting arm 11 or 11' keyed to ashaft12 or 12 which in turn is carried in suitable fixed bearings 13 or13 in a bracket 14 or 14 on the machine frame. Each arm 11 and 11 ispreferably made adjustable for height by a two piece construction withinterengaging teeth, as indicated'at 15. The arm is extended outwardlyat the top, as at 16, this extension carrying a roller 17 and serving tobring theroller, when in the position of Fig. 4,,directly above theshaft 12. The left latch alsocarries locking and releasing featureswhich are not repeated on the right latch for the reason that the twolatches are connected by a link 20 for common motion in oppositedirections, as bestseen in Fig. 1, which shows the link pivoted at itsleft end to a short downwardly directed arm 21 also keyed to the shaft12 and on the right side to a short upwardly directed arm 21 also keyedt0 the shaft 12". o This link 20 is movable to the right by means of acompression spring 22 which bears at its opposite ends against abutmentson the link and on the machine base, respectively, this being aconvenient means for giving the arms 11 and 11 a constanttendency'toward the position of Figs. 3 and 4. The amplitude of themotion of the arms 11 and 11 may be regulated by any convenient means,the preferred form being a stop screw 23 also carried bv the link andadapted to bear against a stop 24 on the machine frame.

The locking means and the releasing means for the entire latch mechanismform a part of the left latch only. This left latch mechanism comprisesthe arms 11 and 21, already mentioned, also a locking arm 30 and a releasing arm 31, all the arms being fast upon the shaft 12. Forconvenience in construction and attachment the locking arm 30 and thelink arm 21 are made as a unitary bell crank. The locking arm extendsinward, and the releasing arm downward and inward. The locking arm 30carries a movable nose 40 on its outer end, this nose beingpivoted as at41 and having a rearward upper extension 42 overlying the outer end ofthe arm 30 and urged aw. y therefrom by a compression spring 43 partlyhoused in said extension. The motion imparted to the nose by the springis limited by a lug 44 on the bottom of the nose,

which lug is stopped against an abutment 45 on the lower side of the arm30. The nose is rounded off near the upper end of its front face asindicated at 46 and has a top bearing lug 47. A catch 48 is fast to theleft front of the squeeze cylinder top to hold down the arm 30, asshown, in the position of Fig. 1 and Fig. 6. In case the catch is farenough down to interfere with the nose 40 when the arm 80 is beinglowered, the rounded face 46 rides on the vertical edge of the catch,and the entire nose tilts back, as shown in Fig. 5, compressing thespring 43. This arrangement enables the lug 47 to snap under thebottomof the catch 48 in any relative positions of nose and catch, andavoids the need of any synchronization of the motion of the squeezecylinder with that of the latch mechamsm. Y The operation of this latchis as follows:

Starting with the table in theposition of Fig. 1, the mold is filledwith sand and jolted as usual. In this position the squeeze piston isdown and of course does not participate in the jolting motion. The catch48 holds the locking arm 30 down and the supporting arms 11 and 11' inthe retracted position shown in 'Fig. 1, within and out of contact withthe ends of the table lifting frame 18 and also below and out of contactwith the table 2, with the result that the jolting motion is not communicated to the latch mechanism. As the table is raised to the squeezeposition, Fig. 3, the latch spring 22 expands, moving the link 20 to theright, thus moving the arms 11 and 11 outward to their respectivevertical positions beneath the lifting frame as illustrated in Fig. 3for the arm 11. Upon completion of the squeeze the frame and table arelowered to the draw position, Fig. 4, in which the frame rests onthearms 11 and 11.

To let the frame and table down from the draw position, Fig. 4, toreturn to the starting treadle 32. Since this treadle is keyed to theshaft 12, the treadle motion moves both arms 11 and 11 inward toward theposition of Fig. 1. It will be noted that in Fig. 3 the point oftangency of the rollers 17 with the bottom surface of the lifting frameis directly in line with the center of the shaft 12 and 12,respectively. Thus the inward motion of the rollers 17 has no liftingcomponent whatever and the only effort to be exerted upon the treadle isthe overcoming of friction, so that the operation of the treadle doesnot call for an excessive muscular effort and its operation during anentire working day does not unduly fatigue the operator.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. A jolt squeeze stripper latch comprising an arm adapted when invertical position to support a jolt table, automatic means constrainingsaid arm to said vertical position, non-automatic means adapted to movesaid arm out of said position, and automatic locking means adapted tohold said arm out of supporting position when the table is in j oltingposition, said locking means comprising a lug attached to the squeezecylinder, an arm positively connected to said supporting arm, and anextension carried by said lastnamed arm, said extension being engageablebeneath said lug when the squeeze cylinder is down.

2. Latch mechanism for a molding machine of the type having a jolt tableand a squeeze piston, said mechanism comprising a pair of arms pivotedbeneath the sides of the jolt table for movement to a vertical positionto support said table and to an inclined position beneath and out ofcontact with said table, link mechanism for moving said armssimultaneously, means constantly tending to move said link mechanism tospread said arms, means operable to overcome said spreading tendency andto move said arms to the inclined position, a lug vertically movablewith the squeeze piston and a locking arm carried in fixed relation toone of said supporting arms for coaction with said lug, said locking armincluding an extension member retractable to pass one portion of saidlug and extendable to catch beneath another portion of said lug whensaid lug is in bottom position.

3. Latch mechanism for a molding machine comprising a pair of armspivoted beneath the sides of the jolt table for movement to a verticalposition to support said table and to an inclined position beneath andout of contact with said table, a link connecting said arms on oppositesides of their respective pivots, a spring tending to move said link inone direction to spread said arms, means operable to move said linkagainst the tendency of said spring and to move said arms to theinclined position, and locking means carried by another arm in fixedangular relation to one of said supporting arms for coaction with acatch on the machine, said locking means including a nose engageableunder said catch in a limit position of the catch, and movableyieldingly along said catch in intermediate positions of the catch. 4.Means for supporting the jolt table of a molding machine when in drawposition comprising a pair of latches mounted on opposite sides of themolding machine and means for simultaneously moving said latches intoand out of a table-supporting position, said moving means comprising aconnecting link between said latches extending across the machine,aspring connected to said link and to the machine base tending to movesaid link to bring said latches into table-supporting position, a stopbetween said link and said machine base, each of said latches comprisingan arm adapted to carry the jolt table when brought into supportingposition, one of said latches also comprising 80 a second arm rigid withrelation to the firstnamed arm and means adapted to engage said secondarm and thereby to hold said first-named arms out of table-supportingposition, said last-named. latch also including I a lever to movelatches in opposition to the tendency of said spring. v I

5. In a jolt squeeze machine, a jolt table, a lug movable with thesqueeze cylinder, a table supporting latch comprising anarm 4 adapted tobe brought into or moved out of supporting engagement beneath saidtable, another arm rigidly related to said firstnamed arm and pivoted incommon therewith, a nose pivoted to the free end of said second namedarm, means constantly urging said nose into a position to underlie saidlug when the squeeze cylinder is in down position and thereby to holdsaid first-named arm out of table-supporting position, and a sidesurface on said lug along which said nose is adapted to ride yieldinglyprior to snapping thereunder.

Signed by me this 8th day of September, 1931. EARL F. OYSTER.

